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CEDWKN LAVVZIENCE CSEY, OF CLCHESTJER, ENGLAND, .LSSXGNOR TU F, lill', Bl'tlllIl-T' de CMPANY LIIVHTED, Ol COLCHTESTER, ENGLAND.,

VALVELESS ROTARY BUMP,

Specification ot' Letters Patent.

isa-tentes nay e, isis.

.Application tiled June 28, i917. Serial No. 177,551.

To all whom imag conocen:

Be it known. that l, lilnwiu linvvsnnon ConsnY, a subject of ltlis Majesty the King ot Great Britain and ireland, residing; at @ld Heath, Colchester, in the county oi Essen, lllngiand, havev invented a new and useiul improvement in Valveless Rotaryv Pumps, of which the following is a specificationn The present invention relates to valvel'ess rotary pumps oi the class in .which the pis ton not only yrotates around an eccentrically disposed pin secured to the punip casing lout ieciprocates "within a cylindrical hole in the driven element at right angles to the anis oi' -r notation, the driven element thus' formed constitutingn a cylinder, revolvingx in a casing tarnished with suction and delivery ports, is an improvement in the invention de scribed in lF'atent No. iti.,

The specification alcove refereed to de-D he piston contained in a driven cylinder, is slidaloly mounted on a ninirotating1 eccen trically disposed pin secured inthe end 'walls ci the casing, said cylinder losing driven hy a shaft situated enteinally to the purnp casing and provided with driving means coactinn5 with driving ineens at oi ahout the perip .ery of the cylinden According; to the niodihcation descrihed herein, eccentrically. disposed pin about Twhich the piston revolves also acts as the driving shaft tor the cylinder and carries means ior directly rotating the latter which in turn reciprocates the piston.

ln the accompanying drawing 1which illuss a'iloed a velveless rotany pump in which trates, as an example, a construction oipninp accoading1 to the present invention y Figure i .is a longitudinal section on line iev-lot 2; and

il is a cross section on line 2-2 of l.

.de in theconstruction described in the eioiesaid specication, the piston l recipro cates in an open-ended cylinder 2, the latter revolving in a casing 3 iurnished With a suction pont e anda delivery pont rl`he piston i, the opposite ends ot which are rounded to conform to the Wall of the casing' 3 is slotted midway hetvveen its ends to receive tvvo plates 6, between which works a roller 7 mounted on. a shaft d one end of which is supported in a closed hearing 9 formed in the end Wall i0, While on the opposite side oi the piston the shait 8 is supported in and passes through a hearing ii ifoiined in the end Wall l2, a stuiiing1 hex i3 losing ilorrned integral therewith, adapted. to co-act with teeth provided on a pinion 'le `ved on the shaft S the outer end which is provided With means to enel-cile same to he dniven hy loelt or coupled to an electric motori, or driven hy other means.,

Ais shovvn in the dravvingg` end Wall lll is made removable, though desired hoth ends may he so Jformed, further, it, desired a second ring ot teeth may he provided on the other side oi the cylinder adapted to engage with a second pinion provided on the shaft e.

rlhe action oi the-pump is the saine as that oia the pump described in aforesaid pnior speciication and need not he iurthei described herein.

`What ll claim is i l, ln a valveless rotary pump, the cornhi nation et a casing", an eccentrically disposed driving shaft, a cylinder located in said casing and adapted to rotate around said drivv ing shait,`a toothed element on said drivingm shait`,.a'long hearing tor said shalt located on hoth sides ot said casing, an internally toothed elen'zent on the driven cylinder adapted'to co-act with the toothed element on. the driving shaft, a piston reciprocat'ufigga in and rotating with said cylinder, and a slot provided in said piston midway hetvveen its ends in which said driving shalt is adapted to slide during the rotative movement et the piston.

Q. 'ln a valveless rotary pump, the coinhination ot a casing, an eccentrically disposed driving shaft, a rollen mounted on said shaft, a cylinder located in said casing; andadepted to notate around said seller, a toothed ele ment on seid driving shaft, a long bearing way between its ends and plates secured'withoreziid shaft located 0n both sides of said in said slot between which said roller is casing, an internally toothed element on the adapted to slide during the rotative move- 10 driven cylinder adapted to l(1o-act with the ment of the pistn.

toothed element on the driving shaft, a pis- In witness whereof I have hereunto set my ton reciprocating in and rotating with said hand. cylinder, a slot provided in said piston mid- EDWIN LAWRENCE COPSEY. 

